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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707a1c41d5770391d5cdad590536be80d7e895094c10f674c5cbbc7c2d532e00' 
  AND token = 'NavOP8p7G9iK9VpG4cspGzouo4d3NJJ9mZmjDStmaNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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