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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36f77d766ea09046942eb5563b67e2bc9c18453799f946c437aa25328bec6b0' 
  AND token = '1/fCWI/bR2ijP5sJrRbJKpTJ6doiS+WDo1OIM42HXL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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