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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e384de93d0d4e6321876a4e5d5ba012fdd714601131683b5062392a331110' 
  AND token = 'WQ8dCuR2sXTC5NnKAinmduhK7k9/dT0Nnzs+IdrjL3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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