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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5910cce1364d2ae0f092b8676cbd94acbce60335120bb8139b0d8e6ac68313' 
  AND token = 'You31FyS5d0SOy5+9N6/XAihfWO5qANQE//a/MXk8+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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