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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46963d9e394a2ab5c85571b266023b88323f5748291eb96ec2bec7fc0335ddc0' 
  AND token = '34eHtMfmD4dEzdWTlCrkKkr7reCn/xB6dpmt4jdHv/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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