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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04957a812c3f43fc0f8a94be59bac63a861bd1b33ef04419de2ac8d3bbbe7d67' 
  AND token = 'UK8sx8zaZPWvO3VCx+uHYeGlLfYtbLTvkZabPYDJ+10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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