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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e2125c40f0bea5cd902c986aebbe2e093645d5ada4f52e1029485b3a476aea' 
  AND token = '16lLbK2ttw79Xj/5ZD4l3S7oWFxNJXsxliZtnbTut4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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