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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5a3979d5c706b1a02fb9f7b2f407b2a10f869580a3f4cb5e80c89bb9865eac' 
  AND token = 'dgwuoXoH+PkEl0KMy9cd1U7qYrar0cVd26/v++Jm/rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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