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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc0abdfd162a1b03bb00bbc35d3d20749dec5c5faa2a4e9d377ac92167e22e3' 
  AND token = 'CA13qUwUc4lSOJx3ctCDAUqVrlB1F0NAqqICZsGj25s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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