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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efaa6e37ab767a5024c8dd647a0fc8bfa3dd05fbbb3e00e2f7309d8bc1d9b72' 
  AND token = 'rEIl0Ozq9zVVnW0cdwPi02s496UtXh9l6B/fzO4AHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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