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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1864f7b5cd20a645035c74d8987177f7209bcf18e8f739e6a5e63d1cc4519059' 
  AND token = '4r7RkyIm9XNgwBWkp6FEsJWA3GZPn8kF25p3Ygjwztg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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