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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cabf285b9f69fd82394ac51467a318cd62911d4aa5d537f5d13203212e42cd' 
  AND token = '7QqVwrJdlpCEwdAg6chgQd22ut+D7foknHSx0S1h9Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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