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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb58a9ceeeb04c25be5d65c813c86bdb30b0d15c6bdfbc1cd9e34005f0411a0' 
  AND token = '46DOikfOTHt7NYVzI4ZYJGph3dTUjj+bVcc8zR6jsec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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