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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93feda1b43fd1dd9eac43012ca554f3bc58434287fb1ee3bfbe4bd39a275e5ab' 
  AND token = 'j4fXEL62suVzhkM+jH2gzqfo9PfH36ZoydqaSexqVbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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