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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b199b6b7895c32d1fb14a7736960595d3ff9ede6250f49e6e262e412f91c9712' 
  AND token = 'LzE1ORBjmbQjM3wjA0wuNpA3JCfn6YVZTvU34l0DfHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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