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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947ea8d2728e4e49c79244a384f2cd1a87b4ac8f3c3d461ad4c086048de1245d' 
  AND token = '+1MorcyYcsCshRWt0hMe/c0N+akgomtyunrll+VhTh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.29893

JSON explain

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