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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf134aaa383a5ecdaf2a868497e23e0aba740e32aa0ea65b146a1e88db33a9c' 
  AND token = 'qVCPiLBlq5GR5mc/C5xJuVOiZvnAFWHQb4I4t1FkmvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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