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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4019de3a8a72ea58d0c49bbc2a5ff1921e5db3e9096c01ad72f5a93e7cf41a' 
  AND token = 'XM/G8jvEASE5w/H+DQqoaOZiWldL5lgWdt2ykJwBes0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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