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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bed2fd69cce29130fd8eaf012fb7dbcc116020a5db392d34911d5a1a064c073' 
  AND token = 'oa7YRHg3WT39sbP6iYxKyaX1WOsVgWHxsMszbZTFqtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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