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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a1c85a5b8bf76e6b40b692bde95bfcfe983fa5f3495096f55e183bc1e043e8' 
  AND token = 'v6bPR1pTPcL8e3GCauKs4Rtgiti/YH5Eya1CMn/f83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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