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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d4ed9f514a8618894efc80723985658d1a58243cced48a7f7ae1dbf5c552b7' 
  AND token = 't9Z3IjSJQRGq92Imhwm751EYsqzsVieeDgSdaxnF8DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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