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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38abb9a153e650db94d7d07a0a6ae12612da56b15dc2722108358adc32a16ac0' 
  AND token = 'DzVwUhXzKDGaGzdO5ic05DtjJ3m8p5p5oAS073BeRYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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