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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2422811d10f884e24b63b63bfdcb6473d7d4450c6d3f4ed8921fe311f6505a9' 
  AND token = '7Kxaeo7i4qCYdYKi77bq/vubbrziM+Ja2dw3G19A9og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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