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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2e630f9bc0da669eb955c69b3b8769f087bd90824150e2e0da7e66c0f64cbd' 
  AND token = '6FoAU2GRaG5tTn0V0FLJX3K7kiLpa8GZXtgddZ38sPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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