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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bbabdb16a025900ae8d72e9963be88d95381d9a6da8218d81ddc6a0957697e' 
  AND token = 'ThWIZAhpvjFGLGMApYUArFrwR2rGtvdnPZ4qbyL+PTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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