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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235991a916cfd105cbc56141536a53f83e2210e13ada19f034eb5d25969fa437' 
  AND token = 'mXdtDHC2L8rjoDKf0YOvR+Fi8UOCly5w9kvN/7neYOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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