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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849491270d900a363f1cb8ca8c19b0e0d63d3c319177994418bc92100e43f6ae' 
  AND token = 'H7Bi6Z4d3jiJv5iUzsZsu/G5ELRsSoqJO5VdLIJzkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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