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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6043cd9612ba71b8226229d1cfeadc978d523392840126c6a040e85f3ef632' 
  AND token = '+EJTYMY/vT2KDlDXi42B0dey1wv1RYbkEoH/nHz1IKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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