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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8c9eb0f2742ec7ddd97eaf8f74df14319803d0238d76eb221df67fd32b2fbd' 
  AND token = 'UiwZtgIjZcYSxp4wiYtAX3w1ngWm2ia6A/FSWZ72zM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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