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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a7bb4dd0183d1643454096c0e2006681e3fc0c390f48e601322fc09fa0d36d' 
  AND token = 'k7KczhntlMOzAIOZhbCCknEJv0zAYmlE11fYSbeY8f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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