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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2bf171dd1cb1dce9913a41e32f93a710ba453a2e0dae2e42d02de74561b9aa' 
  AND token = 'XhbbMmaYh86+DcodY10kVm7185UHqMFRapTavI0auQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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