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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9c765b3a3290ec53f4297541b70b2ec1160f53e64e0ad5115aefd3e30e66c6' 
  AND token = 'fQP8iyav5UNzqqPN5ViUObxwJ3BjvI3w/0W2wPYfmjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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