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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85de91b9f3a4ea1c6ff9f0a3ea365fda1861ce508d82e104e83615c4e614cf54' 
  AND token = 'h7IMQz7v6rqf3FgMHDvCap/6eBaBbEbOlosfqOmkkZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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