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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7a1a7cf4d60b1e5dc0018bfaa0da6370c6f95fbcdb18b83a6b4a5c3f47cbb3' 
  AND token = 'Glvg7BvyEMjXW9nS96E3A73bCem4vvmy1eYQw/GcjOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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