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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4876ce520132c0f9c136844c917ddd7c7e991ad3ea701ec455b84ec07a2cd2f' 
  AND token = 'H8yEZC+UvdO6p5vfTLPmWp+dClJ/seYEcUKhLmMn85Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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