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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f609a072c940e1beacc45cf964d92ca3980da29583e23d6b6738a2322a13f52' 
  AND token = 'Exk7bR5viAvntD071kWxkoIvy9aRJZidD+MYc/fr0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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