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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976f09a51abd9d66bd1d82c36bb5096230fdbe425739d9864f880a4e7c99d3fb' 
  AND token = '4VfjSCFny//L94w9HX0hUtAQGN/C/4/CRWWrLAOJZLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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