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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45482f61f0f2c46fd8e80904f3f3a652fd234f54240cfdf6d5993b284fe5938' 
  AND token = 'OBF+t07QHoEBUYySAv3dLD9bRU3EpVxr8m384jqvdEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}