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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d982af272954c3969b8a7fc625c0a898823bf464af41df8e131790011e1989d' 
  AND token = 'M35au94rxTB0V8FLx0j+8z9AIkQtnR/CA+9e5H13GNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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