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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf0fa0d8e456463ec55653802d647e1b0d445ab38a8670d4c296b2408483db1' 
  AND token = 'mTMrWt+NsffS8uZ7IzGP+6JLyGOm90GqgnIBNfnIl4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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