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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eceeccb952889307f3c238bfb8bfebdac3bf43d7c4e7dd04cc2a5ad694c77bbd' 
  AND token = 'Q6G/DHbKdze416UnMARnenwYMj8yazcipd0JY3Mxvao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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