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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7f9249375c20b60ecf2dddceed5c2a29ec52f50413dbde03850f973108a910' 
  AND token = 'akbXuyAKc5jVH/9Xz9PdVtRB4/BgMiiGqZZZuJGt1vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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