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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f261e8d634e1e6bfced16ef4ae99b0d2620bf685486a450dbc102605df845da8' 
  AND token = '8q/FJKDw51YAr0POEqyPtPW6x/JWANuZEdcqbxnRcXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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