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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6f6fc68bf56306dcf050878954d60469eed4afd348bd941828301eaa43a740' 
  AND token = 'xVv1NrIHo31ZWxxPW5erOr0CJh57fsd1du5PbCP4wIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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