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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39acbd9acd982b57593513d370e16997c565ed2f3e3e3d6b99a96d4982b33290' 
  AND token = 'sy4U+57GxTq+y5eCE+2EG6nUiqF9WF21p9C7DshD+y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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