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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471d604b045f34ffc59c49a7a704e683b3e51ee28a46bc30867721cf7465d8be' 
  AND token = 'unGDDWY9/Sv3A6zwXmsSBykE9rH2HTproMnhrQM4oHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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