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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6fa8f4739928ffdbeae70ee274dba85d5e2b8af2e2082361c6577c3c872e4a' 
  AND token = '3IvxvU/N9YU2NXdbiAE5v6pA0zWI/cdbsNNtObXriOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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