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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ec113e0c1ef762e0c0a4840cbe9df9cbc107b356898e6abfb69962c22ddc85' 
  AND token = 'le4vChyKNEt9j/VGYg+AsD4hR3ECIeIZ3+dx+mMotLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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