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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ea40c08ab5ad0019d9c97966c6e3b895664332a0a1d4c4a16ff92ca2a6484e' 
  AND token = 'RwPpOZ4uguj6Ac7KaWmLPqBj8ii425OP0wMMK5y4S3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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