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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56628248b63fafc65238ba69eacc6dc7a8e1a97001cbbd186ef2a9bd2363c879' 
  AND token = 'FvdmD8UnMFrRTFezoJA6rtvqScGKG8tk/rPS5+aGn/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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