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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955405b2f81cbbdaa7b72c81614840d6b547ebfd09aa93e5e84d2e750b6eadca' 
  AND token = 'DxrLFhEXujDId5ktG5tpePP+Sv1RTMdi7PFuC5G+vrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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