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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68ff80d56fa30dc7da6bf2e96b585c64c3c253e43bb30dcc0bb2b3097eed321' 
  AND token = 'zr3qTaUnw+L9wygQaIFkVIaxGeD/JIvn38+zbJgRims=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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