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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0874b3a0dfc72b99b3befd360728b5ac40013626c0b2ad216f116c9e5f8d58c8' 
  AND token = 'vQyyOA38g/gXZ87h4jGhLmEczTfu5A8PM1Mhr2h9c54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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