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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd50df6a2ecf2b15205213658bd6cfd3022184791afe2114390136563ea9a041' 
  AND token = 'SVbSR6+N15i301GGQWKpRFdafVGpKsSNsD5q7gNjx20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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