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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5271634e3fcd2a4ac99b3e174086c6bc5e31308141b1f1bf86ff41936975b11' 
  AND token = 'Rp8Ru9ylcLEoU4H2G134OnDe207eoTa/n+HXIEHytKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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